The gateway arch in st. louis, missouri, weighs about 20,000 tons. which amount could be the exact number of tons the arch weighs?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.